Everybody has all 3 centers within them, a heart, a mind, a gut. It is important to remember that all the types access all 3 centers via tritype. However, not all types have equal access to the 3 centers of processing.
3-6-9 and 1-8 are the types that flow to all 3 centers via arrows.
3-6-9 have access to all 3 centers most evenly. Perhaps this is what makes them the Chameleons of the enneagram, equally torn in different directions of feeling, thinking and doing.
1 and 8, both gut types, have arrows to the heart center and mind center. However, a 1w9 and 8w9 are more heavily concentrated in the gut center, though interestingly less action-oriented than they would be with opposite wings because the 9 tones down the “doing-ness” of the 1 and 8.
The 1w2 is the “heart 1” with extra access to the heart and the 8w7 is the “mind 8” with extra access to the mind. Both a 1w2 and an 8w7 will be more of a doer than they would be with 9 being the primary wing.
The ones that do not access all 3 centers via arrows are 2-4-5-7.
2 goes to 4 and 8. It has no access the mind via wings or arrows. The 2 is a “mindless” type. They are primarily feelers and doers, not thinkers.
7 goes to 5 and 1. It has no access to the heart via wings or arrows. The 7 is a “heartless” type, primarily thinkers and doers, not feelers.
4 goes to 1 and 2. There are no arrows to the mind. 4s access to the mind is by a 5 wing. So a 4w5 is the “mind 4” and 4w3 is the “mindless 4” which can choose to access the mind by consciously exercising the secondary 5 wing.
5 goes to 7 and 8. There are no arrows to the heart. 5s access to the heart is by a 4 wing. So a 5w4 is the “heart 4” and the 5w6 is the “heartless 5” which can choose to access the heart by consciously exercising the secondary 4 wing.